linux-kernel - Re: [PATCH v2] acpi: Use kstrtoul() instead of strtoul()/simple

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Date:	Sun, 2 Aug 2015 09:16:43 +0200
From:	Pavel Machek <pavel@....cz>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	rjw@...ysocki.net, lenb@...nel.org, robert.moore@...el.com,
	lv.zheng@...el.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, devel@...ica.org
Subject: Re: [PATCH v2] acpi: Use kstrtoul() instead of
 strtoul()/simple_strtoul()

On Mon 2015-07-27 17:32:22, Guenter Roeck wrote:
> simple_strtoul() is deprecated; replace with kstrtoul() and kstrtouint().
> Return an error if the value passed to the sysfs attribute is not
> a number.
> 
> Drop the definition of strtoul() since it is no longer needed.
> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> v2: An additional use of strtoul() was introduced with commit 4fa4616e.
>     Replace it as well.
> 
>  drivers/acpi/acpica/evgpeinit.c | 5 +++--
>  drivers/acpi/sysfs.c            | 8 ++++++--
>  include/acpi/platform/aclinux.h | 1 -
>  3 files changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/acpi/acpica/evgpeinit.c b/drivers/acpi/acpica/evgpeinit.c
> index ea4c0d3fca2d..aa1e8c1f2d4a 100644
> --- a/drivers/acpi/acpica/evgpeinit.c
> +++ b/drivers/acpi/acpica/evgpeinit.c
> @@ -326,6 +326,7 @@ acpi_ev_match_gpe_method(acpi_handle obj_handle,
>  	u32 gpe_number;
>  	char name[ACPI_NAME_SIZE + 1];
>  	u8 type;
> +	int err;
>  
>  	ACPI_FUNCTION_TRACE(ev_match_gpe_method);
>  
> @@ -377,8 +378,8 @@ acpi_ev_match_gpe_method(acpi_handle obj_handle,
>  
>  	/* 4) The last two characters of the name are the hex GPE Number */
>  
> -	gpe_number = strtoul(&name[2], NULL, 16);
> -	if (gpe_number == ACPI_UINT32_MAX) {
> +	er = kstrtouint(&name[2], 16, &gpe_number);
> +	if (err < 0 || gpe_number == ACPI_UINT32_MAX) {

Are you sure you compile-tested this?


>  		/* Conversion failed; invalid method, just ignore it */
>  
> diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c
> index 0876d77b3206..d6ea5712ec57 100644
> --- a/drivers/acpi/sysfs.c
> +++ b/drivers/acpi/sysfs.c
> @@ -616,8 +616,12 @@ static ssize_t counter_set(struct kobject *kobj,
>  			all_counters[index].count = tmp;
>  		else
>  			result = -EINVAL;
> -	} else
> -		all_counters[index].count = strtoul(buf, NULL, 0);
> +	} else {
> +		if (!kstrtoul(buf, 0, &tmp))
> +			all_counters[index].count = tmp;
> +		else
> +			result = -EINVAL;
> +	}
>  
>  	if (ACPI_FAILURE(result))
>  		result = -EINVAL;
> diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
> index 74ba46c8157a..9925c1d5d58f 100644
> --- a/include/acpi/platform/aclinux.h
> +++ b/include/acpi/platform/aclinux.h
> @@ -119,7 +119,6 @@
>  
>  #define ACPI_MACHINE_WIDTH          BITS_PER_LONG
>  #define ACPI_EXPORT_SYMBOL(symbol)  EXPORT_SYMBOL(symbol);
> -#define strtoul                     simple_strtoul
>  
>  #define acpi_cache_t                        struct kmem_cache
>  #define acpi_spinlock                       spinlock_t *

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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